Derrick



Patented July 21, 1925.

UNITED STATES WILLIALI S. HU'ICHINSON, 0F BETHLEHEM, EIENNSYLVANIA.

DERRICK.

Application filed May 18, 1921.

To (LIZ whom it may concern:

te it known that I, VILLIAM S. HUTCH- INsON, a citizen of the United States, and a resident of Bethlehem, in the county of Northampton and State of Pennsylvania, have made a new and useful invention in Derricks7 of which the following is a speciiication.

My invention relates to derricks and consists in an improved sectional mast and boom and in a novel attaching spider for the mast guy ropes and an improved mounting for a guy rope spider.

@ne object of my invention is to provide a derrick which may be knocked down for transportation without undue dii'liculty and which may be adapted for diffe-rent heights of mast and lengths of boom for different jobs or for different stages of the same job.

Another object is to provide a simple means for securing the guy ropes to the top of the mast which permits the derrick to rotate freely and which distrib-utes the guy rope strains more evenly overthe upper end of the mast. I also desire to eliminate the protruding angles and shackles which are present in the usual derrick mast and which are in the way and likely to be injured when the derrick is being transported and set up.

My invention is illustrated in the accompanying drawings in which Figure 1 is an elevation of a complete derrick; Fig. 2 is a section, on an enlarged scale, through the center of the top of the derrick and detailing my improved spider and preferredv method of mounting same, and Fig. 3 is a top view of thc spider.

The derrick mast is composed of structural steel box girders 1, 2, 3 and 4 and the derrick boom is composed of similL r girders 5, 6, 7 and 8. The end girders of both mast and boom are perfectly tapered as shown and the intermediate girders vary in length. Each girder is united with its adjacent gir-der by splice plates 9 and the assembly of adjacent girders by these splice plates is of such nature that the girders may be disassembled from each other and reassembled either in the same relation or in other relations. For instance, girder 2 or 3 0r both may be omitted, shortening the mast, and the boom length may be similarly shortened by omitting girders 6 and 7 or it may be lengthened by insertion Of one or both girders 2 and 3.

Serial No. 470,719.

This construction, besides affording a desirable variation in the capacity of the derrick, is advantageous in the transportation of same. As is well known, complete derrick masts and booms are often longer than railway cars and two or even three cars are sometimes required to transport them. lilith the lpermanently assembled dcrrick members of large dimensions, this awkward and often diiiicult use of cars is necessity. lVi-th t-he construction shown herein, the boom and mast may be readily knocked down and the entire derrick loaded on a single car.

rllhe upper end of girder 4 terminates in an end plate 13 firmly secured to each side of the girder. Spaced below plate 1S is a diaphragm 10 similarly secured. Plate 18 and diaphragm 10 are Vprovided with central openings which form spaced journal bearings for a gudgeon pin 11 which extends beyond the end of the mast and journals.- a spider member 12.

Spider 12 forms the means for securing the guy ropes to the mast. It is preferably a thick disk of cast iron cored out at 13 to provide hook-shaped portions 14 facing upwardly and adapted to enter the usual guy rope eye. The lower surface of the spider rests on end plate 18 and the coring is well spaced from the central hub-like portion 15 whereby the spider is given such a mounting on the mast that any strain from the guy ropes is fairly distributed about the latter instead of being concentrated at one place. It will be noted that the circumference of the spider is beveled inwardly from plate 18 and that a cover plate 16 is secured on the spider top by machine screws 17.

These features avoid injury to the spider when the mast is knocked down and form a marked improvement over the loose links usually secured to the top of a derrick mast and which are always in the way as they project some distance beyond the sides of the mast. Obviously, cover plate 16 retains the guy ropes when the latter are in place as well as protecting and stiifening the spider hooks 14.

The circular shape of the spider is not essential nor are the particular means for journaling it to permit the derrick to rotate on its base, but the general features which eliminate the undue projection of guy-rope securing elements and enable the spider to function as described are advantageous and,

novel and vl Acontemplate mechanical mediiications y,in their use.

Likewise the shape1 dimensions and number of the girder sections are immaterial te my invention so 'long as the 'essential `features of interchangeability and variation in derrick height and reach are maintained.

Having described :my invention -'ully above, l now claim:

Il. The combination with aderrick rinast, of a spiderrotatably mounted on said mast and provided with a series of upwardly eX- tending lugs adapted to receive guy-rope loops, and a cover-secured across the tops of said lugs 'o'r inclosing the spaces formed therebetween.

12. The combination with a derrickniast, of a disc-shaped spider rotatably mounted on said mast and provided with a series of upwardly extending circumferential lugs adapted -to Ireceive guy-rope loops .and an annular cover secured'across the tops of said lugs and inclosing the spaces formed therebetween.

8. The combination with a derrick mast, of a gudgeon pinmounted in spaced bearing plates at the top of said mast, a disc-shaped vspider provi-ded with a relatively wide hub portion .for rotatably engaging said, gudgeon pin, and a series of circumferential upwardly extending lugsformed on said spider for receiving guy-rope loops andanannular coversecured to the'to is of said lugs and seating on said hub :portion around said ,gudgeon pin.

4f. The combination with a'derrick mast, of a gudgeon pin mountedin spaced bearing plates at the top of said mast, a disc-shaped spider provided with a relatively wide hub portion yfor rotatably engaging said gudgeon pin, a bearing face formed at one end of said hub portion and adapted to seat on one of said bearing plates, a series of circumferen- ,ti'al upwardly extending lugs formed on said spider for receiving guy-rope loops and an annularrcover secured to the tops of said lugs and seating on said hub portion around said gudgeon pin.

5. The combination with a derricl: mast, of a 'gudge'on pin mounted in spaced bearing jplates at-the top of said mast, a disc-shaped spider provided with'a relatively wide hub portion for rotatably engaging said-gudgeon pin, a bearing 'face formed at one end of said hub portion and adapted to seat on one of said bearingplates and a series of circumlerential upwardly extending lugs formed on said Aspider vfor receiving guy-rope loops.

In testimony whereof, l have hereunto subscribed my name this 12th day'ol April,

VILLAM S. HUTCl-HNSON. `Witness:

M. J. DIMMIGK. 

